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ThinkFun Family Brainstorms Challenge of the Week

Each week we feature a new puzzle that you can print out in black and white on a single page and use as a black line master with your students. Schools have reported great success by encouraging families to work on the puzzles together at home. Print out the PDF file, file the solution page and make copies of the Challenge page to hand out to your students.
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 A Special Tic Tac Toe... In Arnold's Tic Tac Toe, three in a row loses! You are playing the "O"'s and it is your turn. What move can you make to force Arnold to end up with three "X"'s in a row, so he loses? Download Puzzle (60 KB)  |  Download Solution (70 KB)
 Convention Chuckle... Dora K. Hatton, A. K. Barnes, and J. R. Sweeney had a big chuckle at the convention when they realized that the letters of their names, if rearranged, spelled out the names of each of their home States. From what State does each of these delegates hail? Download Puzzle (73 KB)  |  Download Solution (46 KB)
 Watering Thoughts... Lois is trying to decide which of the two watering cans to buy. She wants the one that will hold the most water. Which one should she buy? Download Puzzle (283 KB)  |  Download Solution (161 KB)
 Magic Triangle... Mrs. Holderman, the math teacher, has given Karen a special math problem. She is to arrange the numbers from 1 to 6 in the triangle so that the sum of each straight line of three circles gives the same result. How would you place the numbers? Download Puzzle (65 KB)  |  Download Solution (63 KB)
 Bear paw... Roland has sketched three different front views of a Teddy Bear for a new building project. From the three sketches, can you select the front view that Roland chose to make the three-dimensional Teddy Bear illustrated above? Download Puzzle (63 KB)  |  Download Solution (58 KB)
 Cryptic Message... Buzzy the furnace repair man was told to go around back and come in through the basement door. The door had no knob or latch, but was adorned with the lettering shown in the drawing above. How will Buzzy get in? Download Puzzle (66 KB)  |  Download Solution (48 KB)
 Basset Pull... On command, these two charming basset hounds are going to pull the rope tight. When they have finished tugging, will there be a knot in the rope? Download Puzzle (237 KB)  |  Download Solution (124 KB)
 Christmas Tree It can be a little Christmas puzzle gift to entertain you for a few minutes at least - only three triangles hidden in a Christmas Tree and the extra one that has to be found. Download PDF Version (224 KB)
 Cannon Duel... Two identical cannons are aimed at each other, their shells fired simultaneously at exactly the same speeds. Ignoring wind resistance for a moment, will they hit each other or will they miss? Download Puzzle (57 KB)  |  Download Solution (66 KB)
 Spinning Skaters... Roland has just completed a new music box. When he spins the green belt wheel clockwise, will the two skating couples spin in the same direction or in opposite directions? Download Puzzle (65 KB)  |  Download Solution (78 KB)
 Mobius Ride... Judy and Dan are the first to try out the latest ride at the amusement park, an enormous mobius strip. If the cars are traveling at the same speed, will there ever be a collision (except possibly Judy's head on the superstructure)? Download Puzzle (62 KB)  |  Download Solution (54 KB)
 Bambeani Blocks... When the Bambeani triplets were born they each received an identical jumbo birthing block. At age 65, they still have their blocks and if asked, will proudly show them to you. With the visual information shown, can you tell what color is on the bottom face of each block? Download Puzzle (257 KB)  |  Download Solution (171 KB)
 Around Dodecahedron In 20 Points Travel along the edges of a dodecahedron (a three-dimensional solid with twelve pentagonal faces) through the 20 corner points of it and then finish at the start point. Download PDF Version (218 KB)
 Bride's Age... When Helen and Frank were married 21 years ago, Frank was three times as old as Helen. Today he is twice as old as she. How old was Helen on her wedding day? Download Puzzle (67 KB)  |  Download Solution (60 KB)
 Cryptic Note... Bob has just been handed a note from Linda, which appears to be written in some sort of code. From the clues she has given, can you help Bob break this code and read the message? Download Puzzle (175 KB)  |  Download Solution (87 KB)
 Matched Set... Kimberly has been told by the jeweler that out of the six earrings he has left, he thinks two are a match. Will Kimberly find a matching pair? If so, which two earrings match? Download Puzzle (57 KB)  |  Download Solution (62 KB)
 Treasure Trail... Professor Pith Bugby is about to enter a maze of hanging bridges is search of hidden treasure. Will his quest be successful? If so, what is his route? Download Puzzle (334 KB)  |  Download Solution (280 KB)
 Cat Count... Wendy has cats. All but two of them are Siamese, all but two of them are Persian, and all but two of them are Main Coon. How many cats does Wendy have altogether? Download Puzzle (67 KB)  |  Download Solution (60 KB)
 Animal Cubes... Only one of the five floating cubes has been made by folding the given pattern. Can you identify the cube that matches the pattern? Download Puzzle (166 KB)  |  Download Solution (145 KB)
 Red Square Fold and Cut... Blanche runs a quilting class. She has asked her students to fold and cut a red square of fabric, following the pattern shown on the chart above. The results are in. Which of the four students' squares is the correct fold and cut as indicated by the chart? Download Puzzle (64 KB)  |  Download Solution (42 KB)
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 Last Updated: November 19, 2010 top
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